Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Caesium-137 is a radioactive isotope of caesium which is formed mainly as a fission product by nuclear fission. It has a half-life of about 30.1 years, and decays by beta emission to a metastable nuclear isomer of barium-137: barium-137m (137mBa, Ba-137m). (About 95 percent of the nuclear decay leads to this isomer. The other 5.0 percent directly populates the ground state, which is stable.) Ba-137m has a half-life of about 2.55 minutes, and it is responsible for all of the emissions of gamma rays. One gram of cesium-137 has an activity of 3.4 terabecquerel (TBq).

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